United States (Guam) Guam Weather in May — Climate Guide
May in Guam is very-high
Guam Weather in May — Quick Answer
As of 2026- Avg temp
- 30° / 25°
- Rainfall
- 130mm · 11 days
- Crowds
- Very busy
As of 2026, Guam in May averages a high of 30°C and low of 25°C with 130mm of rain over about 11 days. Warm tropical + rain.
May is very-high for Guam.
Korean Golden Week peak + Micronesian Fair.
Travel score
Guam May Weather Stats
Avg High
30°C
Avg Low
25°C
Rainy Days
11
130mm total
Sunshine
8h
Daily avg
Humidity
77%
high
UV Index
12
Extreme
Wind
15 km/h
Gusts 30
Sea Temp
29°C
perfect
Crowds
Very busy
At attractions
May Sunrise & Sunset
Air Quality
PM2.5
10 μg/m³
PM10
20 μg/m³
Status
good
Feels-Like Temperature & Wind
Feels like
Daytime
34°C
Nighttime
26°C
Humidity and wind affect how the actual temperature feels.
Wind
15 km/h
Max gust 30 km/h
Activities Recommended for May
May Travel Pros & Cons
Pros
- Korean Golden Week
- Micronesian Fair
- Sea 29°C perfect
Cons
- Rain starting
- Hotels surge
May Events & Festivals
- Korean Golden Week
- Micronesian Island Fair
Guam in May — Full Picture
Korean Golden Week peak + Micronesian Fair.
What to Wear & What to Pack
Warm tropical + rain.
Packing Checklist
Seasonal Weather Overview
Spring (Mar·Apr·May)
Current29.7°C
24.3°C
9/mo
Summer (Jun·Jul·Aug)
30°C
25°C
15/mo
Autumn (Sep·Oct·Nov)
29.7°C
25°C
15.7/mo
Winter (Dec·Jan·Feb)
28°C
23.3°C
10.3/mo
Guam Monthly Weather Comparison
| Month | High | Low | Rain | Sun | Humid | UV | Crowd | Price |
|---|---|---|---|---|---|---|---|---|
| January (Best) | 28° | 23° | 10d·130mm | 7h | 78% | 11 | Very busy | Peak |
| February (Best) | 28° | 23° | 9d·100mm | 7h | 76% | 11 | Very busy | Peak |
| March (Best) | 29° | 24° | 8d·80mm | 8h | 76% | 12 | Very busy | Peak |
| April (Best) | 30° | 24° | 8d·90mm | 9h | 76% | 12 | Busy | Peak |
| May (Best) | 30° | 25° | 11d·130mm | 8h | 77% | 12 | Very busy | Peak |
| 30° | 25° | 13d·145mm | 7h | 78% | 12 | Busy | Shoulder | |
| 30° | 25° | 15d·200mm | 7h | 79% | 11 | Very busy | Peak | |
| 30° | 25° | 17d·230mm | 6h | 80% | 11 | Very busy | Peak | |
| 30° | 25° | 17d·250mm | 6h | 80% | 11 | Busy | Shoulder | |
| 30° | 25° | 16d·230mm | 7h | 79% | 11 | Busy | Shoulder | |
| November (Best) | 29° | 25° | 14d·175mm | 7h | 78% | 11 | Busy | Shoulder |
| December (Best) | 28° | 24° | 12d·130mm | 7h | 78% | 10 | Very busy | Peak |
View Other Months
Guam May Hotel Picks
Frequently Asked Questions
Is May a good time to visit Guam?
Guam in May is very-high. Tourist crowds are very busy and flight/hotel prices are peak.
What's the average temperature in Guam in May?
Guam May averages a high of 30°C and a low of 25°C.
Does it rain much in Guam in May?
Guam May averages 130mm of rainfall over about 11 rainy days.
What should I wear in Guam in May?
Warm tropical + rain.
What time are sunrise and sunset in Guam in May?
Guam May sunrise is 06:25 and sunset is 18:35, with 12h 10min of daylight.
What's the air quality like in Guam in May?
Guam May air quality (AQI) averages 30, rated Good. PM2.5 averages 10μg/m³.
What activities are recommended in Guam in May?
In May, Guam is great for Tumon Bay, Cocos Island, Micronesian Fair.
Is May peak season in Guam?
Guam May crowds are very busy and prices are peak. Advance reservations are strongly recommended.
Best Months to Visit Guam
View Other Months
Planning a May trip to Guam?
You've checked the weather — next come the budget and the route.
Why you can trust weather guide
Based in Chiang Mai for 8+ years, with 30+ countries visited across Southeast Asia, Japan, and Europe. Every detail in this guide is primary-source verified as of April 2026, with prices auto-refreshed via live exchange rate APIs. This isn't AI-generated boilerplate — it's written from the perspective of someone who has actually been there.